DNV2000 - Image 1

DNV2000

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Acoustic Device for the Visually Impaired

The DNV2000 acoustic device, installed at signal-controlled pedestrian crossings, emits an audible signal to indicate when it is safe to cross, upon specific user request. It fully complies with D.P.R. July 24, 1996, No. 503 (art. 6.4), the Italian Highway Code (art. 41, paragraph 5), and its Implementing Regulation (art. 162, paragraph 5).

General Features

The unit is engineered for audible signaling and consists of:

  • Microprocessor-based logic.
  • Sensor for measuring ambient noise.
  • Acoustic transducer to emit the “walk” signal.

Upon request, the signal is transmitted simultaneously to:

  • The acoustic device on the same pole (which stores the request and emits a confirmation sound).
  • The pedestrian request device on the opposite side (push button).
  • The traffic light controller, which integrates the pedestrian phase into the traffic cycle.

Technical Data

Walk Signal
• During Green Light:

  • Pulses: 60/min ±1%
  • Duty cycle: 50% ±1%
  • Frequency: 800 Hz ±10%, modulated at 20 Hz

• During Yellow Light:

  • Pulses: 120/min ±1%
  • Duty cycle: 50% ±1%
  • Frequency: 800 Hz ±10%, modulated at 20 Hz

• Sound Level Adjustment

  • Automatic adjustment relative to ambient noise:
    – Delta: +5/+10 dB above ambient level
    – Sound pressure level: 30 dBA – 60 dBA (in accordance with Table B of DPCM 14/11/1997)